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Xabi Alonso built this team with a process that was not that long and the results were quite impressive, there is no surprise about what happened this season for Leverkusen because they have quite good quality and consistency so that up to now they have managed to create an unbeaten record.
Xabi Alonso has decided to stay at Leverkusen until next season and thus I am quite confident that Xabi Alonso will be able to maintain Leverkusen's performance as he has done so far, regardless of whether it is better or worse, but of course next season's competition will be different. When other top Bundesliga teams improve to be even better, especially Bayern Munich, of course they will be ready to compete fiercely again for the Bundesliga title next season.
Leverkusen was just a mediocre team that was never considered in the competition for the title before Xabi Alonso arrived, now what has happened, he has succeeded in turning Leverkusen into a big team that is very difficult to beat, what's great is that he did all that in just a very short time. Now Leverkusen has become a threat to Bayern Munich in the title race, so far only Dortmund has always provided competition to Munich, but they have never succeeded in breaking Munich dominance.
Xabi Alonso decision to stay with Leverkusen is very good for his future and also the team he manages. Leverkusen has just been able to run fast after receiving support from Xabi Alonso, his departure will have a negative impact on Leverkusen future development. Club management must give Xabi Alonso what he wants to make it easier for him to carry out his duties as a coach, maybe he will try to bring in several new players to increase the team's strength so that it can compete in the Champions League next season.